From 283b833c8e2367cd9d98a1c8572553ef0b870f6c Mon Sep 17 00:00:00 2001
From: omy <omy@opencascade.com>
Date: Mon, 1 Jun 2015 17:39:42 +0300
Subject: [PATCH] 0026278: Canonical recognition from time to time raises
 exception on the attached shape

Corrected array boundaries to avoid Standard_OutOfRange exception in BSplSLib and BSplSLib_Cache on the given shapes.
Code formatting has been corrected for ShapeFix_Edge.
---
 src/BSplSLib/BSplSLib_Cache.cxx | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/BSplSLib/BSplSLib_Cache.cxx b/src/BSplSLib/BSplSLib_Cache.cxx
index dbc8e4198b..bd125aa993 100644
--- a/src/BSplSLib/BSplSLib_Cache.cxx
+++ b/src/BSplSLib/BSplSLib_Cache.cxx
@@ -148,8 +148,20 @@ void BSplSLib_Cache::BuildCache(const Standard_Real&           theParameterU,
                             thePeriodicU, mySpanIndex[0], aNewParamU);
   BSplCLib::LocateParameter(theDegreeV, theFlatKnotsV, BSplCLib::NoMults(), aNewParamV, 
                             thePeriodicV, mySpanIndex[1], aNewParamV);
+
+  // Protection against Out of Range exception.
+  if (mySpanIndex[0] >= theFlatKnotsU.Length()) {
+    mySpanIndex[0] = theFlatKnotsU.Length() - 1;
+  }
+
   mySpanLength[0] = (theFlatKnotsU.Value(mySpanIndex[0] + 1) - theFlatKnotsU.Value(mySpanIndex[0])) * 0.5;
   mySpanStart[0]  = theFlatKnotsU.Value(mySpanIndex[0]) + mySpanLength[0];
+
+  // Protection against Out of Range exception.
+  if (mySpanIndex[1] >= theFlatKnotsV.Length()) {
+    mySpanIndex[1] = theFlatKnotsV.Length() - 1;
+  }
+
   mySpanLength[1] = (theFlatKnotsV.Value(mySpanIndex[1] + 1) - theFlatKnotsV.Value(mySpanIndex[1])) * 0.5;
   mySpanStart[1]  = theFlatKnotsV.Value(mySpanIndex[1]) + mySpanLength[1];
   mySpanIndexMax[0] = theFlatKnotsU.Length() - 1 - theDegreeU;